Backpack

FIG. 1 is a perspective view of a backpack showing our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a left side elevational view thereof.

The broken line showing of the word “HAPPY” is included for the purpose of illustrating environmental structure and forms no part of the claimed design.